A surgery assisting instrument for retinal surgery includes a cylinder and a strip connected with each other. The cylinder and the strip are made of a soft and biocompatible material. The cylinder is preferably connected with the strip at a side surface and close to an edge of the strip. The surgery assisting instrument is placed in a fornix around an eye at a position according to a retinal tear. The cylinder is pressed against the eye and the strip is pressed against the eyelid. Thus the retina is forced toward the back wall of the eye.
